Pneumatic horn



W. A. (MRRATT.A

PNEUMATIC HORN.

APPLICATION flu-:D 1m30, 1920.

Patented Sept. 27, 1921.

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" iJNlTED is-raras frArsNr ortica.

varrnn A; ssamm-T, or coviNeroN, KENTUCKY.

Leanser..

To all wom t may concern. i v

lie; it known that l, W ALTER A.,GARRATT, a-citiaen of the United States, and aresident of Covington, in the county of KentonV and State of Kentucky, have invented certain new and useful llmprovements'in Pneumatic llc-rus, of which the following is a full, clear, and enact description, reference being had to the accompanying drawings, forming a part of this specication. l My invention relates .ticnlarly with adapted to be to horns for use parmotor vehicles, and which are although with modiiications such horns may be employed with air pressure generated in the, engine exhaust. y

lt is the object of my invention herein to provide a sounding device which can be readily and easily( adjusted for various tone values and particularlfy1 to give a most harsh raucous tone. lne device operates on i a, principle discovered by me, wherein a tone, said tone being devices employed in member corresponding to a vmembrane or diaphragm operates as modified by add1t1onal tone generating member.

Among other things the additional devices .are carriedV preferably on the generating v member itself, whereby the movement of the member sets up a vibration in the carried des member itself.

viceA which re-acts to modify the air vibrating function of the member, and at the same time sets up dissonant vibrations of the `Furthermore the valve element acts with the generating member p ently carried, so as to have a partial movement along with the said member, and thereby further disturb the quality ofl sound vi brations and hence tone production.

The elements referred to above and the functions noted, I accomplish` bythatcertain construction. and arrangement of arts which coto be hereinafter more specically pointed.

out and claimed.

ln the drawings, Figure 1 is a central cross section through the device in which to clearly indicatethe structure, the thicknessA of 'some of; the parts' is somewhat out of proportion to y the other parts.

Fig. 2 is a pers ective of the sound p view of the one side generating member. Fig.`3 isa other side thereo Y K Specification o Letters Patent. Application ill-ed January 30, 3.920. Serial operated by suction from the intake manifold oit the engine,

a reed to generate theconnection with saidis resiliperspective view of the A lbe evident that upon suction 'satelites sept. ai', aaai.. lilo. 355,653.

The device has a sound projecting horn l, and a back plate 2. The sound generating element in the form of a relatively thin and vibrant disk 3, is supported between the sound projecting device and the back plate. llhere are gaskets 4 intermediate the projector base l'd and the. disk, and a fairly thick gasket assembly 5 between the disk -and the back plate, the parts being held togather by means of bolts 6 passing-through the assembly, peripherally of the projector, the back plate, the disk and the gaskets.

This construction leaves an air chamber 3l between the disk and the back plate, and an air conduction pipe 7 passes through the back plate into this chamber, said pipe be ing connected by suitably valved conduit;y pipes to the intake manifold of an engine l(not shown).

Vlhe disk has a central aperture throu h .which any air admitted from without to the chamber behind said disk, must pass, and there is rmly united around the periphery of this aperture an annular member 8, which has a cylindrical ilange 9 extending outwardly from the outer surface of the disk, and serves as a valve seat in the operation of the device, as will be noted.

Mounted near the periphery and point of attachment of the disk on the inside of the\ chamber, so as not to aii'ect the disk vibration, is aspring arm l0, W lch carries at its inner end, at the axis of the disk, and the center of theaperture therein, a screw 1l. This screw is -held adjustably in place by means of a nut l2 on one side of the arm, and a nut 13 onv the other.

'llhe screw projects through the aperture inthe disk and carries'at its end, on the outside of the chamber, a valve 14 in the shape of a disk, provided with suitable means on annular valve seat member about the' disk aperture. The valve lies inside of the cy'lin-V y drical flange of said seat.

The center of the back plate is providedA with a boss, within which screws. an ad just-v in'g screw l5. The nlut 12 of d1 th r 1n s r1 arm, ays rearwar y 1n e helegofl'athelgboss, allid, the screw 15 ,Y acts as an abutment for the nut 12, thereby limiting the movement of the 'spring arm, and the valve carried byit, to the desireddegree.

With the parts as so far described it will being 'applied to the valve car'- A complishing the inward motion.

ynature of the motion of the valve with said Suiice it to say that there will be an opening of the space between the valve and its seat on the disk, either at the instant that the valve nut strikes its abutment or just lefore this, due to the superior speed of the isk.

At the rebound of the disk the valve will be carried with it, and vthe continued motion of the disk to and fro, with great rapidity will set up air vibrations, which project themselves through the sound projector member of the'device, and the nature of the sound may or may not be dissonant due to the travel of the valve with the disk as above described.

In addition, as heretofore noted, I apply to` the outer surface of the disk, a vibratory mechanism which re-acts against the disk, and not only effects its vibratory function, but in addition sets up vibrations in the disk itself, which further add a very raucous tone to the sound produced.

This mechanism comprises a yoke 16` clamped at the center betweenthe annular valve member 8 and the disk 3, and thus rigid with the disk. The radial arms of the yoke are however elevated from the surface y of the disk so as not to impair its vibrations.

To the outer ends of the yoke are connected the endsv of an arched spring 17. At the center of this spring is secured a fairly heavy cap 18, having depending yflanges 19. The cap is held in place by means, preferably of a screw20 and a nut 21, andthe flanges 19 lie in normal position slightly elevated above the flange projecting from the annular valve seat of the disk.

This device thus not only acts as a vibratory weight against the operation of the disk, but it also strikes against the flanges of the disk valve seat, thereby' setting up vibrations of the disk itself, which vary from those imparted toy it, by its own motion.

f'Ihe sound produced by this mechanism'isk of a peculiarly penetrating and disagreeable character, and acts as a startling warning when used in connection with a motor vehicle. It is also adapted to be' used in the desired sizes in the place of fire signal warn-- ings o r othei` forms of signals and alarms, in which itis desired to attract attention with a Sound of strikingly different nature from those usually heard/by the persons within the sound radius.

By failure in the above matter to indicate the possibility of the use of mechanical equivalents for the parts described, I do not wish to imply limitations to the claims that follow, in the construction of which, it is my desire that the doctrine of equivalents be fully applied.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

1. In a sounding device, means for peripherally supporting a vibrant disk, means applying suction behind said disk, said disk having at least one opening therein,a valve device of which said opening forms a part, and vibrato mechanism carried by the disk, to modi y the Vibrations thereof. .1

2. In a sounding device, means for peripherally supporting a vibrant disk, means for applying suction behind said disk, said disk having at least one opening therein, a valve device of which said opening forms a part, and vibratory mechanism carried by the disk, to modify`the vibrations thereof, said vibratory mechanism being carried centrally of the disk.

In a sounding device, means for peripherally supporting a vibrant disk, means for applying suction behind said disk, said disk having at least one opening therein, a valve device of which said opening forms a part,

and vibratory mechanism carried by the disk, to modify the vibrations thereof, said vibratory mechanism being located to strike the disk during its vibrations to additionally set up vibrationsk of the disk itself.

4. In a sounding device, means forperipherally supporting a vibrant disk, means for applying suction behind said disk, said disk having an opening therein, and a closure for said openin adapted to act together with said opening as .an air valve, said closure being resiliently carried, so as to `modify the vibrations of air passing through said valve.

5. In a sounding device, means for peripherally supporting a vibrant disk, means for applying suction behind said disk, said disk having an opening therein, and a closure for said opening adapted to act together with said opening as an air valve,l said closure being resiliently carried, so as to modify the vibrations of air passing through said valve, and an abutment for the said resilient closure member, to cause its positive separation from the disk opening at the desired point.

6.--In a sounding. device, means for periplierally supporting a vibrant disk, means for applying suction behind said disk, said disk having an opening therein, and a closure for said opening adapted to act together with said opening as an air valve, said closure being resiliently carried, so as to modify the vibrationso air passingthrough said (valve, and an abutment for the said resili 'nt closure member, adjustable to cause its ,frpositive separation from the disk opening 11; @at the desired point.

' ln a sounding device, means for pe- Y .ripherally supporting a vibrant disk, means for applying suction behind said disk, said io disk having at least one opening therein, a valve device ofwhich'said opening forms a part, and vibratory mechanism carried 'by the disk, to modify the vibrations thereof,

said vibratory mechanism comprising in part d i a substantially heavy member, supported on a spring.

8. ln a sounding device, means for peripherally supporting a vibrant disk, means for a -plying suction behind said disk, said 2o disk aving at least one opening therein, a valve device of which said opening forms a part, and vibratory mechanism carried by the disk, to modify the vibrations thereof, said vibratory mechanism comprising in part a substantially heavy-member, supported on alspring and means on said heavy member spaced from the disk sufiiciently to strike ituponconjoint vibratory movement with the disk, for the purpose described. f 3o 9. ln a sounding device, means for peripherally supporting a vibrant disk, means for applying suction behind said disk, said disk having at least one opening therein, a valve device ot which said opening forms a park-and vibratory mechanism carried by the disk, to modify the vibrations thereof,

said vibratory mechanism comprising a `member mounted `centrally of the disk, an

arched sprin on said member, ay Weighted element ont e arched spring, and flanges `or thelike from the Weighted member lying at their ends in proximity to the disk, as and for thepurpose described.

10. ln a sounding device,

ripherally supporting' a vibrant disk, means for applying suction behind said disk, said disk having an opening therein, and a clo- 'sure for -said `opening adapted to act toL gether with said opening as an air valve,

` said closure being resiliently carried, so as supporting Ato modify the through said valve with the lclosure and its means for pe- 4.

to modify' the vibrations of air passing through said valve With the closure, and itsv mounting comprising a spring arii secured adjacent the periphery of the disk, and a member mounted at. the end of the spring arm and extending through the disk aperture, ing thereon a small disk adapted to seat in the aperture of the disk, on the atmospheric air side of said disk. n j

11. ln a sounding device, means for peripherally supporting a vibrant disk, means for applying suction behind said disk, said isk having an opening therein, and a closure for said opening adapted to actv t0- gether with said? opening as an air valve, said closure being resiliently carried, so as vibrations of air passing mounting comp-rising a spring arm secured adjacent the periphery of the disk, and a supporting member mounted at the end of the spring arm and extending through the disk aperture, said supporting member having thereon a small disk adapted to seat in the aperture oi" the disk, air side of said disk, ber being adjustable pressure of the arm. l

12. In a sounding device, means for pesaid supporting memto control the spring said supporting member havl on the atmospheric ripherally supporting a vibrant disk, means .f for applying suction behind said disk, said disk having an opening therein, and a closure for said opening adapted to act together with said opening as an air valve, saidV closure being resiliently carried, so as to modify the vibrations of air passing through said valve with the closure and its mounting comp-rising a spring arm secured adjacent the peripheryof the disk, and a supporting member .mounted at the end of the spring arm and extending through the disk aperture, said sup-porting member having thereon a small disk adapted toseat in the aperture of the disk, on the atmospheric air side of said disk and an adjustable abutment for the ,supporting member mounted on the suction side of the disk.

WALTER A. GARRATT. 

